<!DOCTYPE html>
<html lang="zh-cn">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body { font: 13px Helvetica, Arial; }
    form { background: #000; padding: 3px; position: fixed; bottom: 10%; width: 100%; }
    form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
    form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
    #messages { list-style-type: none; margin: 0; padding: 0; }
    #messages li { padding: 5px 10px; }
    #messages li:nth-child(odd) { background: #eee; }
  </style>
  <script src="/socket.io/socket.io.js"></script>
  <script src="https://code.jquery.com/jquery-1.11.1.js"></script>
  <script>
    $(function(){
      var socket = io()
      $('form').submit(function(){
        socket.emit('chatMessage', $('#m').val())
        $('#m').val('')
        return false
      })
      socket.on('chatMessage', function(msg){
        $('#messages').append($('<li>').text(msg))
      })
    })
  </script>
</head>
<body>
  <ul id='messages'></ul>
  <form action="">
    <input id='m' autocomplete="off" />
    <button>发送</button>
  </form>
</body>
</html>